Improvement in chimney-tops



T. B. ENTWISLE.

CHIMNEY-TOR.

Patented May 29; 1877.

Fig. 2.

Fig. I.

lll llll Fig. 5.

INVENTURI W M E m 3 EM E ATTVE ing a top plate, d, as shown.

UNITED STATES PATENT OFFICE THOMAS B. ENTWISLE, OF WASHINGTON, DISTRICTOF COLUMBIA.

IMPROVEMENT m CHIMNEY-TOPS.

specification forming part of Letters Patent No. 191,230, dated May 29,1877; application filed April 25, 1877.

To a-l'l whom it may concern:

Be it known that I, THOMAS B. ENTWISLE, of Washington, in the county ofWashington and District of Columbia, have invented a new and usefulImprovement in Chimney- Tops; and I do hereby declare that the followingis a full and exact description of the same, reference being had to theaccompanying' drawings, and to the letters of reference marked thereon.

This invention consists, mainly, in the combination, with thechimney-top, of a peculiar casting, built into the top, as will be fullydescribed hereinafter.

In the drawings, Figure 1 represents a side elevation of my improvedchimneytop, the casting being provided with an auxiliary cap, to preventdown pressure; Fig. 2, a central sectional elevation of the same; Fig.3, a plan view of the chimney, without the cap; and Fig. 4, a plan viewof the casting alone.

To enable others skilled in the art to make and use my invention, I willnow proceed to describe fully its construction and manner of operation.

A represents the casting, consisting, preferably, of a hollow frustum ofa cone, a, rising from a quadrangular base having a flange, a, as shown.

B represents the chimney-top, into which the casting is built in suchmanner as to project above the upper surface of the chimney, as shown.

Orepresents a coating of cement, with which the top of the chimney iscovered, for the purpose of turning the water. a

D represents an auxiliary cap, consisting, essentially, of a perforatedcylinder, (I, hav- This may be employed, if desired, when the chimney isbelow an adjoining house, for the purpose of preventing down pressure onthe top of the flue from descending currents of air.

Some of the advantages resulting from this special construction are asfollows: The upper portion of the chimney is perfectly protected within,so that its mortar is not exposed to the action of the gases resultingfrom combustion, which latter tend to disintegrate the same, and destroythe chimneytop.

The products of combustion also are discharged above the top of thechimney, so

thatno injurious efi'ectcan result from their action.

The mouth of the chimney, also, is so contracted that the pressure ofcold air incidental to an open flue upon the ascending current iseffectually prevented.

The cost of this improvement is comparain diameter at the top; for aneight and one-half-inch flue, eight and one-half inches diameter at thebase, and six and one-half inches at the top.

In all cases a flange or rim is to be cast on the base, one and one-halfinch larger than the largest diameter given above, so as to furnish aproper base for the casting to rest on the brick-work.

' The casting is setupon the brick-work about twenty-one inches belowthe top of the chimney, so that about five inches project above theupper surface of the latter, when the same is finished.

When the brick-work is set, a solid top is formed around the casting,the upper surface of which should be made slightly rounding, and beplastered with cement. 7

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters .Patent, is-

1. The chimney-top described, consisting of the conical casting A,having the square ing, A, set into the chimney, as described, the baseand flange a projecting downward into cement coating 0, as described.

the chimney-top B far enough to properly This specification signed andwitnessed this protect the top, and be firmly? held thereby, 24th day ofApril, 1877.

and up above the upper surface of the same, THOS. B. ENTWISLE. todischarge the products of combustion at a Witnesses:

point removed therefrom, as described. THEODORE S. WEST,

2. In combination with a top, B, and a cast- MAMIE E. STALLINGS.

